[FIR-TEST] Add new testdata generated after changes in previous commit

compiler/testData/diagnostics/tests/controlFlowAnalysis/deadCode/deadCodeInDeadCode.fir.kt

@@ -0,0 +1,24 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+fun unreachable0() {
+    return
+    return todo()
+}
+
+fun unreachable2() {
+    return
+    val a = todo()
+}
+
+fun unreachable3() {
+    return
+    bar(todo())
+}
+
+fun unreachable4(array: Array<Any>) {
+    return
+    array[todo()]
+}
+
+fun bar(a: Any) {}
+fun todo(): Nothing = throw Exception()